//中文
var data_zh = ['你知道吗','六月','一日','星期一','是','儿童节'];
//英文
var data_en = ['do you know','June','One day','Monday','Yes','Children\'s day'];


//左侧的语言显示
var btn_if = document.querySelectorAll('#btn_if button');

//右侧的语音显示
var btn_that = document.querySelectorAll('#btn_that button');

//点击切换语言
var btn_swap = document.querySelector('#btn_swap');

//左侧的输入内容
var text_if = document.querySelector('#text_if');

//右侧的翻译结果
var text_that = document.querySelector('#text_that');

//翻译按钮
var btn_res = document.querySelector('#btn_res');

//默认语言是中文
var lang = 'zh';

//切换语言
function lan(){
	//切换默认语言
	if(lang == 'zh'){
		lang = 'en';
	}else{
		lang = 'zh';
	}
	for(var i = 0; i < btn_if.length; i++){
		btn_if[i].classList.remove('btn-primary');
		btn_if[i].classList.remove('btn-light');
		btn_that[i].classList.remove('btn-primary');
		btn_that[i].classList.remove('btn-light');
	}
	switch(lang){
		case 'zh':
		btn_if[0].classList.add('btn-primary');
		btn_if[1].classList.add('btn-light');
		btn_that[0].classList.add('btn-primary');
		btn_that[1].classList.add('btn-light');
		break;
		case 'en':
		btn_if[0].classList.add('btn-light');
		btn_if[1].classList.add('btn-primary');
		btn_that[0].classList.add('btn-light');
		btn_that[1].classList.add('btn-primary');
		break;
	}
}

//点击翻译按钮的方法
function res(){
	//数据
	var date;
	//检测数据库里面有没有这个词汇
	var if_text = false;
	
	//看看中文词库里面有没有这个词语
	for(var i in data_zh){
		if(text_if.value == data_zh[i]){
			if_text = true;
			data = data_zh;
			text_that.value = data_en[i];
			
			if(lang == 'en'){
				lan();
			}
		}
	}
	
	//看看英语词库里面有没有这个词语
	for(var i in data_en){
		if(text_if.value == data_en[i]){
			if_text = true;
			data = data_en;
			text_that.value = data_zh[i];
			
			if(lang == 'zh'){
				lan();
			}
		}
	}
	if(!if_text){
		text_that.value = '';
		alert('无法翻译');
	}
}
